Question

• When should you solve a system of equations by graphing?
• When should you solve a system of equations by elimination?
• When should you solve a system of equations by substitution?

Answer 1

If you are looking at linear equations it really its at your choice... you can solve any system of equations by any of the methods...

quadratic or higher and a linear, I use substitution most of the time... but again, this can be done graphically

you can solve any equation graphically

e.g. x + 3 = 5

just graph y = x + 3 and y = 5... it will show you x = 2

Answer 2

Depends on what the question looks like. Elimination is usually the easiest, but it gets tricky sometimes. I only use graphing as a last option and professor dont usually ask this

Answer 3

Those wt really know how to answer them. asked me , i dont really know how to answer them each individually

Answer 4

If you're given:

`x` = 3 + y
2x + 5y = 7

Use `substitution` since in this case, x is isolated and you can substitute the expression for x in the first equation into the second equation.


However if you're given:

x `+ 2y` = 4
3x `- 2y` = 5

Use `elimination` since you can simply add both equations together to get rid of the y variable.

Answer 5

If given

`y` = 2x - 3
`y` = 5x - 4

Then use `graphing` since both equations are in the form y = mx + b. You can simply enter both equations into your graphing calculator to find the (x,y) intersection point.

Answer 6

Thank you.